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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee4fbf0a113b00ce5245f2407f6d835ab76d7e8051ebcfaff492cc216532146' 
  AND token = 'nngipDYzgrMGsyCmhLSMPfoDzzDLak5Iem7fLCI2gz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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