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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596e47ed4dcb2da95f07d8ed7cfc302dfaff2143454579298e6894ba0a27870e' 
  AND token = 'H6V5Cpe6GrTogw+rnHIPITvrB/d6khMH+Sgjif4Ep/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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