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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd700f6ffe5a1c198faecaa00cac5df17c15890613926e01be2494ba140ff302f' 
  AND token = '+GfEQ2mTEhUjC/Zr7HcPwy6SIZPh0+X5UFcLL6Bopsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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