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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ce43fd8a07ee8d58b84e4461ab1f35a580a42e9ea8c6f890f4a1ccca8ba3cb' 
  AND token = 'KI+Fs1gcnW2ehNtWLRQmTkQuLqryHugHBioG+0b9g4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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