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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccf2f86d9e2c2380a68862257bcbe4708f6c0e27c3d27ddc768d5bfb4b6169c' 
  AND token = 'g3wtJXmRXR2fKRIVHZ1tvfPSFqjhiEP3dzrNdqW4SF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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