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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbad69bc03f62aa1c0464ce2d6be5fd138a2bd17395b5df93fd94303529a23dc' 
  AND token = 'CQwnOl2/CGtYqm1vyaregiqC+nyidSuaciqc54VCzYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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