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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0ad175fe262f1bcfd0ba94a7ae20a2a76824b81425babbff03f5b2c848edbf' 
  AND token = 'L4ueFwadnYt+2Qvx+Go/SPyNWaZwGB7fN3pi+xfrh6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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