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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0693ca2c8b311c07b69ceb53637aa9e5a6f81bc89138a11c24bcba3d51f11a5' 
  AND token = '5pW7jfyQ/ic3aojaOFN5DJy9MhvU9l6+8z+I0Di1hX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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