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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310ab8cf667bc66717df1ad0db6b018b1ff2feb5b33eb6ca390624a70e7e1d93' 
  AND token = '2pPyfienEplYs62faT8EGst1BbrgA+i1Df4tPToEWO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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