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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8b2095cc5c6cd9cc0e359f6eeaebd281b0abee8a8e6bb1ccdeb17d5312585a' 
  AND token = 'ZZ7Xz4HuwPKXx1bj1A1FFeI6MLZ7HRAu1YANik7g9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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