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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79914172e4886708d8dc3da701aec2b655a79b307aa68871c045bb0b10cebc0' 
  AND token = '3OIJdzbgUb/wzovrqW24Yekj24Og79RPfW3ht6pdbkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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