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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea33f37e088cf534b7ba3f0b54f3553f67719843784781bb1d0ec1db2c41cd2' 
  AND token = '2MxjxQGYtSTan5JdwtAz+uAJ6V4LKeeHkaJn1KbJFmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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