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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3ff1e985e9e5464d1166fba6c9208a51cc895d07d5be7bc84922a5d3555950' 
  AND token = 'oZs4jZhLlJ9t/LDPhAMPcJ4hD8IaZ1ADL6NazcU+z44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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