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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d111191a6c66be7708e65a5bcdea26cf8028037c8d4d7023ee21f707127cfa' 
  AND token = '04ajoPBB/c/NMX9w6ayNAfyj/RQJZyIr8cNRKMAn574=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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