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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0766a54118b18793a064c09326326e2deae2cdef2beba7c9741f833840c7a00' 
  AND token = 'h0486C/ixKWwh84CVbztrcQpKPI3rlcBkQ6+iq1KUA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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