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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4571ce06de1921b83d9001b31b617f32f7d9eefd112148308e627274ad19a511' 
  AND token = '7YnquZJuLIP4n3+nUQSkOhVb5qPYLhEto9YSBsXssUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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