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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65de6bc94b482b10fbb18333c191c2d06d25782c0e3a9a337f9a2649a9f5da59' 
  AND token = '5nKG9u6iXDGdefZqdVMk7H0QtxJyUchSv8No96gEnko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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