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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bc42787ccc507401dc57f4a0f3a2432b33591860c80ef481b3bcf9f6664df2' 
  AND token = 'kOpPp4Ag9vv+2iD1O8+SG1R+A0r+Tk2Tr9C3jvVDng4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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