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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d5e7f6bd6f1aa702d19b6783de53d570888d2bb5c55b88e0fdccc134d28198' 
  AND token = 'tZ/prJUlKWyOf82s5XUUQXKEKVqN7Mrw1svfJGO9qeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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