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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343a0030f3d9a9ae6757d0ab3f77f6eba914883fff172202a0b53721a2924f23' 
  AND token = 'Mi2o1liZxcXYZxNPJAcOCCPM/q0ezx1oJiQVdYOwnf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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