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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8312d65dfff26df5d5f78dd597d4b9cc673f941884e6d710da9397db1fcabb0' 
  AND token = 'be0y4TQCqJ9ebCTZNAktFILWzYqMdluDx2a0z1fV2y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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