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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b7703335f7d69b4069ba7a1a694467092fad2a7838ee83361731b66c359379' 
  AND token = 'DvbdyBA830wYoDEJUP3Bf8ZKz+Ngsz0XvPlw1on1p14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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