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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf4dd6afbb179e9ca388219d7e1ab03cfb18987fc3628883693a0dbae916dfe' 
  AND token = 'LLls/bA1TD4tGj647tim6Shn/OM/F8bI2ZIdSLI8zgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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