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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf211407ee8c5f5621300beae3a7631d4b6e1f3bf6a904c14e4143cac5d71bd' 
  AND token = 'i1jmJZlTan/D+i+N2kPHdEUFeDZhHxwoX62hR2E2x8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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