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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1902811288e296aee407e4c60384d8a886e4ec1b8cf5e26a2dff186719c39c' 
  AND token = 'IJLwRsstZp6Q4rerpDBpFEEv9fG7oPyPpsG9CyCgtZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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