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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35675f67e63f486596d67fe6255725f3d6c398b00623e4c594cdcea58b86922' 
  AND token = 'JWaoZw6MZckDFMwEpdi2P9LpEtgKUeiFxAbdzrfU9o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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