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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92648bbb99dd0c1e6e3262e659de11b1a70df3bb6cb9284403b9e417d18aebf' 
  AND token = '7vGryHbyUkprrHHjWubM3PW/jzc3Zp82QXfnMmk9yIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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