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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87ca7f00422f56b2ae5f9447b93431e6c8ec385cdade9ed36f2d164c11c9cb3' 
  AND token = '4xzn5kcx9JarK/Q+89brXICVmTtO1hEXZyD8oC4TgTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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