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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c255cfae6344853b43a1ffaaf964faf32f0888551668907b63cc2fc2694dfe' 
  AND token = 'Opnu+3DrQX5Bx/U3F67Rd8gzKDE2ZXbs/oDQ2emt9qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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