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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3808a21b0c4de64c83e6956331da2464786f2819b2cfc2acb3e25d665ed2f2' 
  AND token = '6f4ND6R72e7DAcrmL3ggzBCxE4Bm0giJiTggW2WRxIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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