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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95f471efc68707712c4c2eea67021fd6cae06de63ce78f763b41dd1ad31df46' 
  AND token = 'EwGOi1K0m/K41gB5bB5YqnO4DrqY96gSxs9Q+6ghUPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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