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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cb944732dd6c95c1be7a6bd3742e869e7f6d090e4f4ab2c2936817e65fcc51' 
  AND token = 'epHiou0RwExDWJbleumRMP3HLpf5n1zyUG3f9wK4RFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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