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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a1f57e7464762abbd7d00c9df00056f6a2a57979c764cdcc5f1e95cdca0d07' 
  AND token = '9biH4U32OZrn6/Q2OcASQZ26nCySyoomd5fcX6lzgBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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