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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82cae69d9ae44cb05fe5b3d1b21f7a12da11ec83996e7dd86771eeecba16d26' 
  AND token = '8OE8x2/L8//WesrMo2LC9dpJE38Fbu444I3HLzjZT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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