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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c11459be6bd08caf2d8d94ef1d880357672cb5419b7e7554713f2378bb6706' 
  AND token = '0sUjuMb6WI6toHRqTLb/FmTj3Gt4SweQp4zNK4E8njo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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