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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f543892f662d7b4c3e6db2ec0392fa2b993ea10189acef9f0c07bf4c6763a2' 
  AND token = 'SlJrDzmvZNV0vlWY46exb/V9rl6K1Gex632xnkSqVlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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