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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342159f90490ae5bef04c725b2ff7cc0a676107427d8f966a996988358349064' 
  AND token = 'fPo4wr/iOmreG4wJjUiUb5rY+owkxgwPkslcV3JM7+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}