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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9614b5cbb1b5007db28ae23c9c2d7eee8e14173e2e20b886597155410f628a8' 
  AND token = 'EX5o6z3wdvjx5ZmTWKNIDU3gSlOZlDKI8kWPUpatiEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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