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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8dc6974a1aea5d4261f9bf42a761df59492e37b5d15c010494b1bc0a1869d5' 
  AND token = 'QuolRLsS2vEsSkeR+L/w3ozo4BId8dPJumK7hLaDXCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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