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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9db1bd492827985e7a0a8ff2c3b1a6084e6b16782b42f2a99bcb708a0573bd' 
  AND token = 'HS4zYKexrt8r/fOyss0Y1T+QPHS0CCNqyc5XCMVhhTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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